#include <stdio.h>

#define TRUE 1
#define FALSE 0
#define SQ(x) (x) * (x)

/**
 * 题目：宏#define命令练习。
*/
int main(int argc, char const *argv[])
{
    int num;
    int again = 1;
    printf("如果值小于 50 程序将终止。\n");
    while (again)
    {
        printf("请输入数字：");
        scanf("%d", &num);
        printf("该数的平方为： %d\n", SQ(num));
        if(num>=50)
            again = TRUE;
        else
            again = FALSE;    
    }
    
    
    return 0;
}